fetchnews: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/lib/cyrus/bin/fetchnews - from package: cyrus-nntpd
/usr/sbin/fetchnews - from package: leafnode

You may install the required package with command apt-get install {package}

Error in other languages:
fetchnews: bevel nie gevind nie
fetchnews: comandă negăsită
fetchnews: comando não encontrado
fetchnews: commande introuvable
fetchnews: command not found
fetchnews: käsku ei ole
fetchnews: không tìm thấy lệnh
fetchnews: komanda nerasta
fetchnews: Kommando nicht gefunden.
fetchnews: kommandot finns inte
fetchnews: komut yok
fetchnews: nie znaleziono polecenia
fetchnews: níor aimsíodh an t-ordú
fetchnews: no se encontró la orden
fetchnews: no s'ha trobat l'ordre
fetchnews: opdracht niet gevonden
fetchnews: parancs nem található
fetchnews: perintah tidak ditemukan
fetchnews: príkaz nenájdený
fetchnews: příkaz nenalezen
fetchnews: команда не найдена
fetchnews: командата не е открита
fetchnews: 命令找不到
fetchnews: コマンドが見つかりません